In a quarterly review of its long-term projections, the central bank maintained its forecast that consumer inflation will gradually accelerate towards its 2 percent target next year.
As widely expected, the BoJ voted unanimously to maintain its pledge of increasing base money, or cash and deposits at the central bank, at an annual pace of 60 trillion to 70 trillion yen ($592-$691 billion).
BoJ Governor Haruhiko Kuroda will hold a news conference from 3:30 p.m. (0630 GMT).
The BoJ has stood pat since launching an intense burst of stimulus in April last year, when it pledged to double base money via aggressive asset purchases to achieve its 2 percent inflation target in roughly two years.
The central bank issues a semiannual report on the outlook of the economy and prices in April and October of each year.
It reviews the forecasts in January and July.